Multi-proxy evidence for early to mid-Holocene environmental and climatic changes in northeastern Poland

Lauterbach, S., Brauer, A., Andersen, Nils, Danielopol, D. L., Dulski, P., Huls, M., Milecka, K., Namiotko, T., Plessen, B., von Grafenstein, U. and Declakes, Participants (2011) Multi-proxy evidence for early to mid-Holocene environmental and climatic changes in northeastern Poland Boreas, 40 (1). pp. 57-72. DOI 10.1111/j.1502-3885.2010.00159.x.

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We investigated the sedimentary record of Lake Hancza (northeastern Poland) using a multi-proxy approach, focusing on early to mid-Holocene climatic and environmental changes. AMS 14C dating of terrestrial macrofossils and sedimentation rate estimates from occasional varve thickness measurements were used to establish a chronology. The onset of the Holocene at c. 11 600 cal. a BP is marked by the decline of Lateglacial shrub vegetation and a shift from clastic-detrital deposition to an autochthonous sedimentation dominated by biochemical calcite precipitation. Between 10 000 and 9000 cal. a BP, a further environmental and climatic improvement is indicated by the spread of deciduous forests, an increase in lake organic matter and a 1.7 parts per thousand rise in the oxygen isotope ratios of both endogenic calcite and ostracod valves. Rising delta 18O values were probably caused by a combination of hydrological and climatic factors. The persistence of relatively cold and dry climate conditions in northeastern Poland during the first one and a half millennia of the Holocene could be related to a regional eastern European atmospheric circulation pattern. Prevailing anticyclonic circulation linked to a high-pressure cell above the retreating Scandinavian Ice Sheet might have blocked the influence of warm and moist Westerlies and attenuated the early Holocene climatic amelioration in the Lake Hancza region until the final decay of the ice sheet.

Document Type: Article
Keywords: scandinavian ice-sheet atmospheric circulation patterns stable-isotope records younger dryas climate lacustrine carbonates laminated sediments last deglaciation wigry lake radiocarbon calibration holocene changes
Research affiliation: Kiel University
Refereed: Yes
DOI etc.: 10.1111/j.1502-3885.2010.00159.x
ISSN: 0300-9483
Date Deposited: 01 Nov 2012 04:57
Last Modified: 23 Jan 2013 10:01

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